This document discusses different digital modulation techniques:
1) Amplitude Shift Keying (ASK) represents digital data as variations in the amplitude of a carrier wave, keeping frequency and phase constant. It has simple modulation/demodulation but is highly sensitive to noise.
2) Frequency Shift Keying (FSK) represents binary digits by transmitting two different frequencies, with the peak amplitude and phase held constant.
3) Phase Shift Keying (PSK) varies the phase of a transmitted signal to convey information, with the simplest method being BPSK using two opposite phases. PSK has good noise immunity and no bandwidth limitation.
This presentation covers:
Some basic definitions & concepts of digital communication
What is Phase Shift Keying(PSK) ?
Binary Phase Shift Keying – BPSK
BPSK transmitter & receiver
Advantages & Disadvantages of BPSK
Pi/4 – QPSK
Pi/4 – QPSK transmitter & receiver
Advantages of Pi/4- QPSK
This presentation covers:
Some basic definitions & concepts of digital communication
What is Phase Shift Keying(PSK) ?
Binary Phase Shift Keying – BPSK
BPSK transmitter & receiver
Advantages & Disadvantages of BPSK
Pi/4 – QPSK
Pi/4 – QPSK transmitter & receiver
Advantages of Pi/4- QPSK
The Quadrature Phase Shift Keying QPSK is a variation of BPSK, and it is also a Double Side Band Suppressed Carrier DSBSC modulation scheme, which sends two bits of digital information at a time, called as bigits.
Instead of the conversion of digital bits into a series of digital stream, it converts them into bit pairs. This decreases the data bit rate to half, which allows space for the other users.
QPSK (Quadrature Phase Shift Keying) is type of phase shift keying. Unlike BPSK which is a DSBCS modulation scheme with digital information for the message, QPSK is also a DSBCS modulation scheme but it sends two bits of digital information a time (without the use of another carrier frequency).
The amount of radio frequency spectrum required to transmit QPSK reliably is half that required for BPSK signals, which in turn makes room for more users on the channel.
introduce the basic modulation tech (PSK, FSK, QAM etc)
and comparison between them.
ref : Communication System (4ed, Haykin)
this ppt is for my seminar
Frequency-Shift Keying, also known as FSK is a type of digital frequency modulation. It is also often called as binary frequency shift keying or BFSK
Similar to analog FM, it is a constant-amplitude angle modulation.
This presentation will discuss the concepts behind FSK
This presentation contain each and every single information on the topic.
If you like it do follow and like my presentation.
It would be worth my efforts.
The Quadrature Phase Shift Keying QPSK is a variation of BPSK, and it is also a Double Side Band Suppressed Carrier DSBSC modulation scheme, which sends two bits of digital information at a time, called as bigits.
Instead of the conversion of digital bits into a series of digital stream, it converts them into bit pairs. This decreases the data bit rate to half, which allows space for the other users.
QPSK (Quadrature Phase Shift Keying) is type of phase shift keying. Unlike BPSK which is a DSBCS modulation scheme with digital information for the message, QPSK is also a DSBCS modulation scheme but it sends two bits of digital information a time (without the use of another carrier frequency).
The amount of radio frequency spectrum required to transmit QPSK reliably is half that required for BPSK signals, which in turn makes room for more users on the channel.
introduce the basic modulation tech (PSK, FSK, QAM etc)
and comparison between them.
ref : Communication System (4ed, Haykin)
this ppt is for my seminar
Frequency-Shift Keying, also known as FSK is a type of digital frequency modulation. It is also often called as binary frequency shift keying or BFSK
Similar to analog FM, it is a constant-amplitude angle modulation.
This presentation will discuss the concepts behind FSK
This presentation contain each and every single information on the topic.
If you like it do follow and like my presentation.
It would be worth my efforts.
Digital to Analog Conversion works with Students
Introduction
Different Mechanisms
Amplitude Shift Keying (ASK)
Frequency Shift Keying (FSK)
Phase Shift Keying (PSK)
Quadrature Amplitude Modulation(QAM)
DATA COMMUNICATIONS AND NETWORKING – BEHROUZ A FOROUZAN
Digital Communication System
Communication Channels
AWGN: Universal channel model
Band Limited Channel: Channel BW <Signal BW, ISI
Fading Channel: multipath waves
Basic Modulation Methods
Criteria for choosing Modulation Schemes
Power Efficiency: Required Eb/N for certain error probability over AWGN channel
Bandwidth Efficiency: no. of bits per second that can be transmitted on system bandwidth.
System Complexity: Amount of circuit involved and complexity
System Performance Parameters
Average SNR
Outage Probability: instantaneous prob. Exceed certain limit
Average BEP
Amount of Fading/severity of fading
Average Outage duration: O/P SNR fall below certain SNR
will provide you a basic introduction about digital modulation techniques, provide a basic introduction of ASK(Amplitude shift keying) PSK(phase shift keying) FSK(frequency shift keying) and will also provide a introduction about types of PSK
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Session Overview
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Knowledge engineering: from people to machines and back
Modulation techniq of modem
1. Aspects of Digital-to-Analog
Conversion
• Bit rate is the number of bits per second.
• Baud rate is the number of signal
elements per second.
• In the analog transmission of digital data,
the baud rate is less than or equal to the bit rate.
2. Carrier signal
• A carrier signal is a transmitted electromagnetic pulse or wave
at a steady base frequency of alternation on which
information can be imposed by increasing signal strength,
varying the base Frequency, phase or Amplitude.This
modification is called modulation.
3. Amplitude Shift Keying (ASK)
• ASK is a form of modulation that represents digital data as
variations in the amplitude of a carrier wave. The amplitude
of the carrier (modulating signal), keeping frequency and
phase constant.
5. Amplitude Shift Keying (ASK)
Advantages
• Very simple modulation and demodulation
Disadvantages
• High sensitivity to noise
• Low bandwidth efficiency
6. Frequency shift keying (FSK)
• FSK is a method of transmitting digital signals. The two binary
states, logic 0 (low) and 1 (high), are represented by an analog
waveform. Logic 0 is represented by a wave at a specific
frequency, and logic 1 is represented by a wave at a different
frequency.
Peak amplitude and phase are constant
8. Phase shift keying
• Phase-shift keying (PSK): the phase of a transmitted signal is
varied to convey information. There are several methods that
can be used to accomplish PSK.
9. Phase shift keying
• The simplest PSK technique is called 2-PSK or BPSK. It uses
two opposite signal phases (0 and 180). The state of each bit
is
• determined according to the state of the preceding bit. If the
phase of the wave does not change, then the signal state stays
the same (0 or 1). If the phase of the wave reverses that is
changes by 180 then the signal state is flipped.
10. Phase shift keying
• PSK minimum bandwidth = ASK minimum bandwidth.
Advantages of PSK:
• Not susceptible to noise.
• No bandwidth limitation
Disadvantages:
• Distinguishing small difference in phase depending on the
equipment used.
12. QPSK
Advantages
• Very good noise immunity
• Baud rate is half the bit rate therefore more
effective utilization of bandwidth
• Low error probability
Disadvantages
• The generation and detection of Qpsk is
complex